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Vitamin A Content of Pasture Plants

I. WHITE CLOVER (Trifolium Repens) AND KENTUCKY BLUE GRASS (Poa Pratensis) UNDER PASTURAGE CONDITIONS AND FED GREEN

Agricultural Experiment Station, Moscow, Idaho

ABSTRACT

Vitamin A content of pasture plants deserves consideration, first because so large a proportion of the total feed supply of dairy cows is derived from pastures, and second because the vitamin A content of milk and butter may be influenced by the ration of the cow.

Sherman and Smith (11) suggest that the cow is able to store a surplus of vitamin A in the body during the summer months when fed green plants. This store may then be drawn upon during the winter months when the cow is fed dry feeds.

Under uniform stall feeding conditions McLeod, Brodie, and Macloon (7) found that milk varied little in vitamin A content from season to season. Drummond, Coward, and Watson (2) in 1921 pointed out that the vitamin A content of milk at different seasons is dependent upon the diet. Kennedy and Dutcher (5) found that the amount of vitamins A and B in milk depends upon the abundance of the supply in the feed of the cow.